DOI: 10.1002/2014GL059255
论文题名: Variability and trends in anticyclonic circulation over the Greenland ice sheet, 1948-2013
作者: Rajewicz J. ; Marshall S.J.
刊名: Geophysical Research Letters
ISSN: 0094-10155
EISSN: 1944-9886
出版年: 2014
卷: 41, 期: 8 起始页码: 2842
结束页码: 2850
语种: 英语
英文关键词: Anticyclonic circulation
; Atmospheric Circulation
; Greenland Ice Sheet
; Melt
; Ridging
; Vorticity
Scopus关键词: Climatology
; Melting
; Vorticity
; Anticyclonic circulation
; Atmospheric circulation
; Direct measures
; Geopotential height anomalies
; Geopotential height variations
; Greenland Ice Sheet
; Interannual variability
; Ridging
; Glaciers
; advection
; air temperature
; anomaly
; anticyclone
; atmospheric circulation
; clear sky
; geopotential
; ice sheet
; temporal period
; trend analysis
; vorticity
; warming
; Arctic
; Greenland
; Greenland Ice Sheet
英文摘要: Melting and mass loss on the Greenland ice sheet have accelerated in recent years. Possible causes include broader Arctic warming, reduced snow/ice cover, lowered ice sheet albedo, and changes in atmospheric circulation. Anticyclonic ridging over Greenland leads to southerly advection of warm air and clear-sky conditions, promoting high melt rates. To examine the relative importance of ridging, we examine direct measures of summer 500 hPa anticyclonic circulation strength and frequency in Greenland from 1948 to 2013, isolating the atmospheric circulation signal from 500 hPa geopotential height variations. Anticyclonic circulation anomalies account for 38-49% of the interannual variability and trend in summer air temperature and melt indices. Vorticity-detrended geopotential height anomalies explain an additional 13-27% of the variance. We identify an abrupt, persistent shift to strong anticyclonic circulation in central Greenland beginning in 2001, which has contributed to recent increases in Greenland ice sheet melt. Key Points Anticyclonic circulation signal is isolated from background warming in Greenland Anticyclonic circulation strength explains 38-49% of variability in melt A shift to strong anticyclonic circulation in central Greenland began in 2001 ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84899040462&doi=10.1002%2f2014GL059255&partnerID=40&md5=5ca20261743bb0eb27f9057f6206d8e9
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7419
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geography, University of Calgary, Calgary, AB, Canada
Recommended Citation:
Rajewicz J.,Marshall S.J.. Variability and trends in anticyclonic circulation over the Greenland ice sheet, 1948-2013[J]. Geophysical Research Letters,2014-01-01,41(8).